Improved mill-bur feeder



N- PETERS. PHOTO-LITHOGRAPMER, WASNINGTON. D C.

duits-d gioire ARTHUR P. LAWSHA, or HARPERS FERRY,'WEST VIRGIIA.

Leiters Patent No. 102,279, ma April 26, 1870.

IMPROYED MILL-BUR FEEDER.

The Schedule referred to in these Letters Patent and making part of the sama To all whom it may concern Be it known that I, ARTHUR P. LAwsHA, of Harpers Ferry, `in the county of`JefIerson and State of West Virginia, have invented a new and improved Bur-Feeder; and I do hereby7 declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings forming a partof this specification, in'which- Figure 1 is a sectional elevation.

Figure 2 is a perspective view.

This invention consists of a sheet-metal tube called a bowl, intended to be introduced within the eye of of vau upper mill-stone or runner, said bowl being se` cured at its 'lower end to the balance-rind, and provided with a pair of flaring half-tubes extending downward from its lower edge, one' at each side ot the balance-rind and reaching nearly to the surface of the nether or bed-stone; and said bowl being combined with an external tube or outer bowl which tits its outside closely, and may be removed therefrom `at pleasure, which outer bowl is furnished witlra funnelshaped flange at its upper end which closes the eye of the lunner, the function of the ange being to direct the whole force of the air-current down through the inner bowl and half-tubes, for the purpose of keeping the latter clear; and the inner and outer bowls being made separate, in order that the latter maybe removed when it is desired to draw the lower ends of the halftubes together before introducing them within an eye whose upper end is too small to receive thenr unies thus sprung together, the removal of the outer bowl enabling the inner bowl to change its shape conformablyl to the springing of the half-tubes, which it could not do if conned within the outer bowl.

In the drawingais the inner bowl..

B B, the half-tubes.

Theeye of the runner is often of tapering form,

larger at the bottom than the top. Itis desirable that the half-tubes should flare a-s widely as possible, in order to bring their lower orifices over the furrows of the bed-stone, so as not to deposit grist, middlings, 85o., upon the skirt of the bed-stone or thatA central part which is not furrowed, and where whatever is deposited clogs the burs. But, when the half-tubes flare so much as to be wider at their lower ends than the upper end of the eye of the runner, they must needs be drawn together in order to getting them into place. when the inner bowl is not within the outer one.

rlhe half-tubes having been duly inserted within the eye of the runner, spring outward again to their original shape. The inner bowl having been attached to the balance-rind, the outer bowl o is slipped on, and its funnel-shaped flanged closes the eye, thus preventing any air iinding its way outside the bowls.

rlhe half-tubes extend downward to within an inch of the surface of the bed-stone, and 'the revolution of the runner, by forming partial vacuo at the lower ends of the half-tubes, causes currents of air to rush through them and prevent them from becoming choked.

The'lialf-tubes are each forked, as shown in tig. 2, so as to give room for the driver to pass between them.

Having thus described my invention,

What I' claim new, and desire to secure by Letters Patent, *is* v The inner bowl a, provided with daring and forked half-tubes B B, and combined with the outer detachable bowl o, provided with the funnel-shaped flange il, all constructed to operate as described.

ARTHUR P. LAWSHA.

\Vitnesses WM. B. -WERMoAG, WILLIAM BU'r'rs.

Such drawing together is easily accomplished v 

